Lianas, woody. Stem grayish brown, flat. Branchlets slightly flat, with longitudinal ridges, glabrous; tendrils unbranched. Leaves palmately 5-foliolate; petiole 10-15 cm; petiolules 1-4 cm, central petiolule 2-3 × as long as lateral petiolules, glabrous; leaflets oblong, elliptic-lanceolate, or obovate-elliptic, 8-18(-22) × 3.5-9 cm, glabrous, lateral veins 6-8 pairs, veinlets raised abaxially, inconspicuous adaxially, base broadly cuneate or subrounded, margin 5-9-toothed on each side, teeth usually large, apex cuspidate. Inflorescence umbelliform or a compound dichasium, cauliflorous, 9-11 cm, with nodes and bracts; peduncle 2.5-8 cm, glabrous or pubescent. Pedicel 2-8 mm, pubescent. Buds elliptic or oval, 1-3 mm, apex obtuse or rounded. Calyx saucer-shaped, pubescent, teeth inconspicuous. Petals oval, 0.8-2.5 mm, apex galeate, papillose. Filaments filiform; anthers yellow, oval. Disk well developed and 4-lobed in male flowers, inconspicuous in female flowers. Pistil in male flower abortive; ovary oval in female flowers; style inconspicuous; stigma 4-lobed. Berry elliptic or ovoid, 1.5-2 × 1.2-2 cm, 1-4-seeded. Seeds elliptic, flat, base and apex subrounded, ventral holes furrowed from base to apex. Fl. Apr, fr. Jun-Dec.
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